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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e470045a51179e217203c00792f9fece66f6a9877817c0a8ecb153657462d74' 
  AND token = '3D64m3w6iexfhVk4CMIhHHSvNi3LhgozA1J4mn6X5LQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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