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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de4b061da291c4934b6eac86b3130e843a965c44e01f2a7103fcefc0c3ae0850' 
  AND token = 'Kms3sCVM/t+c3s/fdRRfful9H9RVaGxclw3TBNzc+WY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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