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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee32bc96fad550fa01c9fc17c023f42007bd329f1bb3b92cee423193b4197e8b' 
  AND token = 'nDCJ4y+tqh3AXbb6775OBOTHZ52QwThTfP9+JEAtHfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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