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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '281e91477cd33c25ecff31d12eea838ac75823c649e83ab0e9a67b672d47399b' 
  AND token = 'ECLHxxE62pUa+d/+83N0RGtxWueEnN7ENFlO+lLXiIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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