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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9de9e7a3236c8629c55ffc99d39725c25a7395e0c94bf94413eea54beb202d66' 
  AND token = '0aHXEvcKClrR+ILHRmK7k6usxipWFDvNetV1UybjiI4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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