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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb154bd1631728714bc1ff18455cdfce3c0017a73a786c5cb83aa7b29ab18c07' 
  AND token = 'XhbqdflTgp8u/rz0qXxO1Io6pH251W1220M4GNFjD4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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