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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f38b2e4f6e321edcad293056f8f00b687c4e84214872fb59cc9f00fe2cccb0b0' 
  AND token = 'ol1qWOV9umg5nN3i+wOTmsC3S8A/oSfysdOSwT4wabU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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