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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1b84a96ea7a8a721d7800eb8f56291bf663b07e96b6717d146a03e4a3938b8' 
  AND token = '4j11ZtLVWMkvuVQE32XGRU+DOjlzR7a96ae8KtPj6D0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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