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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00cc2f9909eac68b8a3ab20585e8af6fac99bd6fcc4884762f1107f7b797d534' 
  AND token = 'rr54vZMCpxkoz3Vrkfo6EqcFpCHGpl5GM3BwwArf89w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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