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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e83e14e35c9bf5efdfad1b9657cf0fa237941ad77d7a39e81a641dd2c924c23d' 
  AND token = '/7RItX2xs0j8ZZ53nT4ZTsEHzrOU06hCGb0mmWAg3n4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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