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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad711ce09647fca2100f0f119a9c382ef0a86204389c50683add7f6703a6946d' 
  AND token = 'ejgvxtug+IA07Bj7W/9UXRDHvbNHTgeq3KkgzeKKTQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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