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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'adc3012884934ec923bd25468cf0afe0ec0935e4367bf9a353960cbc6efecf68' 
  AND token = 'yOuLRKVw2TMlXR5FEQzz0l3J1UX8I6jAfNcr5yc3a2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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