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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b60a9c93290794d0643eebb6a7ca342e6ef106ebf577640263cb69ed47b600' 
  AND token = 'uMRCi6fAD8mg3cYYv5KCW5x3ctiqfkHLtlDoky9zQKA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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