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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '289dcbe772c42de27b5d22f936d46ddb7e2ed7ace99465dc56205ef51d5002a7' 
  AND token = 'jgeLNzcrXAxBdzFSyj7PclYQ7r40QhEXg6DBOWCeX14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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