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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d875444d8c64d366c2a613cbdf9b77d54bf31b368812ac416cc868fea079596' 
  AND token = 'shYs+I5vj4CAUbxefQVQ0n1U5sTMTIGAF9XFoRDwIag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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