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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58dda6a13daadfabea3b3fef734c445b7fffe18d00011fa6d5e4f5872e9a41bc' 
  AND token = 'Ozrd+N+JgcCuNjzeOJNHmRi82uSCEq/0UXpUy1rCkmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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