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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24a66797e893b07cd358af53f6258b9bfb28c45d1ae48b66bf6b0d93df728368' 
  AND token = 'OTVU26t6iOfVQ3fAKihsKRZbICOTn2L7U30vDOv79Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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