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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa09d01d216f04a9f551fa3ab1f0e4347799d4591e0d052c22d55f54fcdda6f1' 
  AND token = '5WSOqFe/vvTO3T0CrniKAJAXyoNzbsA05kWFTuRj89s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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