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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd11b90089f523f16558a661e8bdeaa1c0ecad338ad8f5bef6af42c903a2e4b45' 
  AND token = 'aV3xxZCxqWekWWsknuUmYpda4+mrQiXOkHxYf4Gyj7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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