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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e750f1e1c1d292b456a3c2e91042db55a588f537d4e85b89220fc6ea3499d0' 
  AND token = '7esPCzqQdF8vL4jHaedwVOChsBK7NS52ns06m8wOoD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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