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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fec489153241adf6a0105fb9bcea4c87dcd26a267209eedac5bfa63869bb0be' 
  AND token = 'FklSkNu1wWgOgyFjeprC+H3hK0KL6VJED1R2glEPEPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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