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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082431098d1f99a53140cc9356f843fb46a8f0625db771e57536639969955394' 
  AND token = '0coSmbu6bDc6uPAsDZixSdOR+3dextGmYb9BJvjcjJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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