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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8504d75317ee8bbb091e4dc30130d1ca00fd5f19da816a5a6fa665ee47d5726f' 
  AND token = 'nC4TNXcceabGUGuMo2KeZaIgG5EEXXtk+D+6tiAlHIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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