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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712e3c68f72cb2a1d3952b1e9a874df136728b0094b4d692c73b75248ad83090' 
  AND token = 'nW1m39+FaKoyqeKY4L5TGIVEH3WPgU5V2QD3gyIu838=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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