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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '984f2e8064ebfd67da42ad14b8b8c96fb6a239ec99e003438fd2fb6dc419fd65' 
  AND token = 'mkX1w6Ig/rYMVDEIGigm3ekfVswaIRntz3wt76k7li8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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