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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2c299a275e6bccd75cab1e8d27a1ff8db39fa6bab7187a335404c4e4e64c47b' 
  AND token = 'Kg1UOKIoPvrqrYEWyLHYWkUIIiSOcMBs/sLUM3G4rbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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