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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de125ae834a481c0683c72b84ad07d5c04bcabe0aa3ee955a877eb8536c7f610' 
  AND token = 'Uk5IjporkzULECNgiOdDgT0R07prR6ZlUxbpUt3kbXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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