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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ae1c58e19bfe3519e0b8298c1a6c605170b073656f3f00174f1f6cc6c72136' 
  AND token = 'B39sBaay3lqkBzt3X6A0Nzn9o/2G4ue+HzNhR/xJsko=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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