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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab821885e17f3f76798e17fb2a0067d49c0e736c246c52309cd7301504eb709' 
  AND token = 'eF2Fl1O8AwyFDA1x3w2jdQrcf1mc9mpAqLU28cyTOgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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