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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38ebf2e1ba6db5124022af4ea0f22a54334c729e51c954dc8315c8e06b2b22c5' 
  AND token = 'pHCnXlSlgwiH8oyygWH3SrCvfYITlQ5oV3UwiBO0k/A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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