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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38bf1b912b4b725c02e6eb22d199a225bb9c3f86e5a748dad4bf9847cf402d78' 
  AND token = 'UXbestkN2GtMLAML+2xubkbuaBStOIEWaaBCkHnxQFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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