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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '925676ce9fbf0e4e6fbfd477d66507024a8443290d5a00f46b7a39eb98b181de' 
  AND token = 'GeCdTfc6/PIDy0uaZg9ubSCNkJj/Qm+dORaoejHFeVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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