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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c33ee28d15bd27cbdd2e7e3d6d6c91a934422fed682bb9a1766e06a99e5726b' 
  AND token = 'H11hO8GYeU1XVsfy3Du8a8SPV485qpBbrNqWOqftuHs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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