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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9306a86fff5f39d99ac3933b8914fa18171f9af806afd34bae0f9a245641ae96' 
  AND token = '0jys0gsnvo9+Ld2XQmjHBAwEAMF1/rGMvS1jITRjRmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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