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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aee567e3ae4c1254727b5ae6358063f51d249c3cb445816ee1c98e027a0b7883' 
  AND token = 'WJmpV2A35YLLeqdQTkfzUHHPqLzR40ACZ78rilCoYPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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