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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf8502983246a49afbb0eed3761f64e256f27b4d0682b5cc2e76116b3a9bf842' 
  AND token = 'W6sJgGXgvJEbCXDRKCspNild8UVY5uoY98fopHrN9K0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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