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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d77d62dfe23fb1dfb40289c88ea31c3339722f4a549705a7ca1ccdd2b28cbb2' 
  AND token = 'FIEeMpG2k5AK9c5GT+d1yGn1Gjj83TUjFvkEf9HJMdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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