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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1604bf489aff3ebc399430f5b905ed14a099d9ff1be7af89abde91273b325d3' 
  AND token = '7raAE2dtejlY16ui3COptvkxpJUrkRyIg8oUtOqLW0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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