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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '833fc91e62d5809a97a9dd9b6be4bec78e00710396e4d60070abc687891a1aa6' 
  AND token = 'kLs8VIF93035DU4bMjKixa4hS726mBRonj2SMT2am8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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