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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5302529c7bbeeaae9589c02c79c9a682ab6041599165859d2d2a4fc1b30345' 
  AND token = '9KFaW8rPm1//sChbnx/sQmNSP6/mNNi+0U0cpMTGCIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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