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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9833933486e8665132ff646e786a3f4b4070d224ef044cef1820e7aed23557' 
  AND token = '9XBsVYkRean9o7tyzw3k1cLDrlgP82w6OwCX7N9wHiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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