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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee81a8de81a89b5237c56625b8418a911d43f91b04aaf163d132b98b74f67c0e' 
  AND token = 'FhKlPd7aMZLSeCtMIU4deQt9RZuepchVu/E/jr4XO4I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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