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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93899eef49c48fcc2fe0c7e3344d8b0291d545d9ab4adc3b8686185f3ccdec35' 
  AND token = '/vrtz8fRrtk41UsdS9XXotOQpDmIV+51gRvdi8/aMAs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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