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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03d3ad9d690e57436f02ac9a165f0f1908baddb8ebe19ade06c790b404def9ac' 
  AND token = '+uORbll5y5iOiGMdJhqJPLu1E7TMi3/0QIqkqxhXp9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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