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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2628ce094d9905ebc673411bb417526e14bd6ff0ab910b056ff0f05bb86307' 
  AND token = 'LPXhYt0BP3TAw3K3/qp8eG4ESJbYLUNrOMMiiRP+B7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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