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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc0b53d002ef2b61a25c32b80ed0298dd6c444cf33267cd5836d1fa37be8812e' 
  AND token = '5g6zEV9nof6ab3KaZ2GdSAo7fsjnCBfzHKQp50upIXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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