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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8522f7d9d66a35275bf43c9296ac3edd4c564d35c1b7046c4cffe89423fda7' 
  AND token = 'ipr9KSpOPS8oeZA0l1VxzCkvfZkq1nOiWgJ4LnXPeWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}